Warp IPv4 doesn't work while IPv6 works


I’m trying to setup Warp on Linux (Debian) as a Wireguard profile. I’ve used the following configuration:

Address =
Address = 2606:4700:110:892f:607d:85a6:5e07:70cf/128
PublicKey = bmXOC+F1FxEMF9dyiK2H5/1SUtzH0JuVo51h2wPfgyo=
AllowedIPs =, ::/0
Endpoint = engage.cloudflareclient.com:2408

IPv6 connections over the VPN work fine. However, IPv4 doesn’t. I can see outgoing packets getting sent over the tunnel, but I get no responses. Any idea what is missing?